I have an original 1817 Common Rifle that has been percussioned, cut down to half-stock, and bored out that would be a good source of parts for the new stock going under that Colerain barrel. The lock would have to be re-converted and Rifle Shoppe carries the parts, I think. The original stock could be used by lengthening it to save work, and you could even keep the original barrel so you would have a real shooter with the Colerain and a "diddled with" original for conversation.